TDA7296S
60V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
VERY HIGH OPERATING VOLTAGE RANGE
(
30V)
DMOS POWER STAGE
HIGH OUTPUT POWER (THD = 10%, UP TO
60W)
MUTING/STAND-BY FUNCTIONS
NO SWITCH ON/OFF NOISE
VERY LOW DISTORTION
VERY LOW NOISE
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
CLIP DETECTOR
MODULARITY (MORE DEVICES CAN BE
EASILY CONNECTED IN PARALLEL TO
DRIVE VERY LOW IMPEDANCES)
DESCRIPTION
The TDA7296S is a monolithic integrated circuit
in Multiwatt15 package, intended for use as audio
class AB amplifier in Hi-Fi field applications
(Home Stereo, self powered loudspeakers, Top-
class TV). Thanks to the wide voltage range and
to the high out current capability it is able to sup-
ply the highest power into both 4
and 8
loads.
The built in muting function with turn on delay
simplifies the remote operation avoiding switching
on-off noises.
Parallel mode is made possible by connecting
more device through of pin11. High output power
can be delivered to very low impedance loads, so
optimizing the thermal dissipation of the system.
June 2000
IN-
2
R2
680
C2
22
F
C1 470nF
IN+
R1 22K
3
R3 22K
-
+
MUTE
STBY
4
VMUTE
VSTBY
10
9
SGND
MUTE
STBY
R4 22K
THERMAL
SHUTDOWN
S/C
PROTECTION
R5 10K
C3 10
F
C4 10
F
1
STBY-GND
C5
22
F
7
13
14
6
15
8
-Vs
-PWVs
BOOTSTRAP
OUT
+PWVs
+Vs
C9 100nF
C8 1000
F
-Vs
D97AU805A
+Vs
C7 100nF
C6 1000
F
BUFFER DRIVER
11
BOOT
LOADER
12
5
VCLIP
CLIP DET
(*)
(*) see Application note
(**) for SLAVE function
(**)
Figure 1: Typical Application and Test Circuit
Multiwatt15
ORDERING NUMBER: TDA7296SV
MULTIPOWER BCD TECHNOLOGY
1/11
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Supply Voltage (No Signal)
35
V
V
1
V
STAND-BY
GND Voltage Referred to -V
S
(pin 8)
60
V
V
2
Input Voltage (inverting) Referred to -V
S
60
V
V
2
- V
3
Maximum Differential Inputs
30
V
V
3
Input Voltage (non inverting) Referred to -V
S
60
V
V
4
Signal GND Voltage Referred to -V
S
60
V
V
5
Clip Detector Voltage Referred to -V
S
60
V
V
6
Bootstrap Voltage Referred to -V
S
60
V
V
9
Stand-by Voltage Referred to -V
S
60
V
V
10
Mute Voltage Referred to -V
S
60
V
V
11
Buffer Voltage Referred to -V
S
60
V
V
12
Bootstrap Loader Voltage Referred to -V
S
60
V
I
O
Output Peak Current
10
A
P
tot
Power Dissipation T
case
= 70
C
50
W
T
op
Operating Ambient Temperature Range
0 to 70
C
T
stg
, T
j
Storage and Junction Temperature
150
C
1
2
3
4
5
6
7
9
10
11
8
BUFFER DRIVER
MUTE
STAND-BY
-V
S
(SIGNAL)
+V
S
(SIGNAL)
BOOTSTRAP
CLIP AND SHORT CIRCUIT DETECTOR
SIGNAL GROUND
NON INVERTING INPUT
INVERTING INPUT
STAND-BY GND
TAB CONNECTED TO PIN 8
13
14
15
12
-V
S
(POWER)
OUT
+V
S
(POWER)
BOOTSTRAP LOADER
D97AU806
PIN CONNECTION (Top view)
QUICK REFERENCE DATA
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
S
Supply Voltage Operating
12
30
V
G
LOOP
Closed Loop Gain
26
40
dB
P
tot
Output Power
V
S
=
30V; R
L
= 8
; THD = 10%
60
W
V
S
=
25V; R
L
= 4
; THD = 10%
60
W
SVR
Supply Voltage Rejection
75
dB
THERMAL DATA
Symbol
Description
Typ
Max
Unit
R
th j-case
Thermal Resistance Junction-case
1
1.5
C/W
TDA7296S
2/11
ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit V
S
=
24V, R
L
= 8
, G
V
= 30dB;
R
g
= 50
; T
amb
= 25
C, f = 1 kHz; unless otherwise specified).
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Operating Supply Range
10
30
V
I
q
Quiescent Current
20
30
60
mA
I
b
Input Bias Current
500
nA
V
OS
Input Offset Voltage
10
mV
I
OS
Input Offset Current
100
nA
P
O
RMS Continuous Output Power
d = 0.5%:
V
S
=
24V, R
L
= 8
V
S
=
21V, R
L
= 6
V
S
=
18V, R
L
= 4
27
27
27
30
30
30
W
W
W
Music Power (RMS) (*)
t = 1s
d = 10%;
R
L
= 8
; V
S
=
30V
R
L
= 6
; V
S
=
24V
R
L
= 4
; V
S
=
23V
60
60
60
W
W
W
d
Total Harmonic Distortion (**)
P
O
= 5W; f = 1kHz
P
O
= 0.1 to 20W; f = 20Hz to 20kHz
0.005
0.1
%
%
V
S
=
18V, R
L
= 4
:
P
O
= 5W; f = 1kHz
P
O
= 0.1 to 20W; f = 20Hz to 20kHz
0.01
0.1
%
%
SR
Slew Rate
7
10
V/
s
G
V
Open Loop Voltage Gain
80
dB
G
V
Closed Loop Voltage Gain
24
30
40
dB
e
N
Total Input Noise
A = curve
f = 20Hz to 20kHz
1
2
5
V
V
f
L
, f
H
Frequency Response (-3dB)
P
O
= 1W
20Hz to 20kHz
R
i
Input Resistance
100
k
SVR
Supply Voltage Rejection
f = 100Hz; V
ripple
= 0.5Vrms
60
75
dB
T
S
Thermal Shutdown
150
C
STAND-BY FUNCTION (Ref: -V
S
or GND)
V
ST on
Stand-by on Threshold
1.5
V
V
ST off
Stand-by off Threshold
3.5
V
ATT
st-by
Stand-by Attenuation
70
90
dB
I
q st-by
Quiescent Current @ Stand-by
1
3
mA
MUTE FUNCTION (Ref: -V
S
or GND)
V
Mon
Mute on Threshold
1.5
V
V
Moff
Mute off Threshold
3.5
V
ATT
mute
Mute Attenuation
60
80
dB
Note (**):
MUSIC POWER is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity)
1 sec after the application of a sinusoidal input signal of frequency 1KHz.
Note (**): Tested with optimized Application Board (see fig. 2)
TDA7296S
3/11
Figure 2: Typical Application P.C. Board and Component Layout (scale 1:1)
TDA7296S
4/11
APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1)
The recommended values of the external components are those shown on the application circuit of Fig-
ure 1. Different values can be used; the following table can help the designer.
COMPONENTS
SUGGESTED VALUE
PURPOSE
LARGER THAN
SUGGESTED
SMALLER THAN
SUGGESTED
R1 (*)
22k
INPUT RESISTANCE
INCREASE INPUT
IMPEDANCE
DECREASE INPUT
IMPEDANCE
R2
680
CLOSED LOOP GAIN
SET TO 30dB (**)
DECREASE OF GAIN INCREASE OF GAIN
R3 (*)
22k
INCREASE OF GAIN
DECREASE OF GAIN
R4
22k
ST-BY TIME
CONSTANT
LARGER ST-BY
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
R5
10k
MUTE TIME
CONSTANT
LARGER MUTE
ON/OFF TIME
SMALLER MUTE
ON/OFF TIME
C1
0.47
F
INPUT DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C2
22
F
FEEDBACK DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C3
10
F
MUTE TIME
CONSTANT
LARGER MUTE
ON/OFF TIME
SMALLER MUTE
ON/OFF TIME
C4
10
F
ST-BY TIME
CONSTANT
LARGER ST-BY
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
C5
22
FXN (***)
BOOTSTR APPING
SIGNAL
DEGRADATION AT
LOW FREQUENCY
C6, C8
1000
F
SUPPLY VOLTAGE
BYPASS
C7, C9
0.1
F
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
(*) R1 = R3 for pop optimization
(**) Closed Loop Gain has to be
26dB
(***) Multiply this value for the number of modular part connected
MASTER
UNDEFINED
SLAVE
-V
S
+3V
-V
S
+1V
-V
S
D98AU821
Slave function: pin 4 (Ref to pin 8 -V
S
)
Note:
If in the application, the speakers are connected
via long wires, it is a good rule to add between
the output and GND, a Boucherot Cell, in order to
avoid dangerous spurious oscillations when the
speakers terminal are shorted.
The suggested Boucherot Resistor is 3.9
/2W
and the capacitor is 1
F.
TDA7296S
5/11
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